My dad, a former NFL player and high school football coach, had a knee replacement about a year ago (he's had both shoulders, both hips and a knee replaced ~ my kids call him a Cyborg
). He tends to push his recovery a little too fast and becomes impatient with therapy but he was very glad he had it done.
I'll be going in for surgery in a couple of weeks, too, for a hysterectomy. So, it looks like we'll be recovering together.
I'll keep you in my prayers.